Title :
Analysis of effects of imperfect channel estimates and GI length in an OFDM system
Author :
Heda, Sardeep ; Ray, Baijayanta ; Chakrabarti, Subit
Author_Institution :
Dept. of Electron. & Electr. Commun. Eng., Indian Inst. of Technol., Kharagpur, India
Abstract :
In this paper, we have derived closed form analytical expressions for describing effects of delay spread and imperfect channel estimation on performance of an OFDM system under conditions of both sufficient and insufficient guard intervals. The treatment has been extended to derive an equalizer for OFDM transmission with delay spread much greater than the CP length. Analysis has also been carried out to highlight the implications of frequency and symbol timing offset on multipath performance of OFDM. The analytical results have been supported by appropriate simulations.
Keywords :
OFDM modulation; channel estimation; delay estimation; equalisers; frequency estimation; multipath channels; timing; GI length; OFDM system; closed form analytical expressions; delay spread; equalizer; frequency offset; guard intervals; imperfect channel estimates; multipath performance; symbol timing offset; Bandwidth; Baseband; Channel estimation; Delay; Equalizers; Frequency response; OFDM; Performance analysis; Power system modeling; Timing;
Conference_Titel :
Personal Wireless Communications, 2005. ICPWC 2005. 2005 IEEE International Conference on
Print_ISBN :
0-7803-8964-6
DOI :
10.1109/ICPWC.2005.1431321
